Some do some don't...
There are "self exciting alternators" that use the residual magnetism in
them to generate
the required field currents.
So both are correct, is and is not required, you need to get the
correct one.
Bob
On 4/5/2010 9:14 PM, Editorgary@aol.com wrote:
> In a message dated 4/5/10 4:59:40 PM,healeys-request@autox.team.net
> writes:
>
>
>
>> Alternators on the other hand have to have power in the circuit to
>> excite them. That means there has to be voltage to excite them.
>> No battery = no excitation
>>
>>
> Fascinating, Now maybe you can explain why my race car with an alternator
> in the ignition circuit, and a battery hooked to ground with a cut-off
> switch, would happily continue to run when I switched off the battery. Tracy
> has
> just rewired it so that the cut-off switch now has four terminals, two for
> the ground cable to the battery, and two that connect the alternator into the
> ignition circuit.
> Gary
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